Use exit code from command if exists

internal/code/code.go

@@ -126,7 +126,11 @@ func Execute(code Block) Result {
 
 		// update status code
 		if err != nil {
-			exitCode = 1
+			if cmd.ProcessState != nil {
+				exitCode = cmd.ProcessState.ExitCode()
+			} else {
+				exitCode = 1 // non-zero
+			}
 		}
 	}
 

internal/code/execute_test.go

@@ -46,7 +46,7 @@ func main() {
 			},
 			expected: code.Result{
 				Out:      "exit status 127",
-				ExitCode: 1,
+				ExitCode: 127,
 			},
 		},
 		{